build(deps): bump org.testcontainers:testcontainers

Bumps [org.testcontainers:testcontainers](https://github.com/testcontainers/testcontainers-java) from 1.21.2 to 1.21.3.
- [Release notes](https://github.com/testcontainers/testcontainers-java/releases)
- [Changelog](https://github.com/testcontainers/testcontainers-java/blob/main/CHANGELOG.md)
- [Commits](testcontainers/testcontainers-java@1.21.2...1.21.3)

---
updated-dependencies:
- dependency-name: org.testcontainers:testcontainers
  dependency-version: 1.21.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

build.gradle.kts

@@ -50,7 +50,7 @@ dependencies {
     testImplementation("junit:junit:4.13.2")
     testImplementation("commons-io:commons-io:2.19.0")
     testImplementation("commons-codec:commons-codec:1.18.0")
-    testImplementation("org.testcontainers:testcontainers:1.21.2")
+    testImplementation("org.testcontainers:testcontainers:1.21.3")
     testImplementation("org.jetbrains:annotations:26.0.2")
     testImplementation("ch.qos.logback:logback-classic:1.5.18")
     testImplementation("org.hamcrest:hamcrest:3.0")